Display driver

Abstract

A display driver includes an interface circuit block which is disposed in a second area AR 2 of first to third areas AR 1 to AR 3 and transfers data through a serial bus using differential signals when a direction from a first side L 1 which is a short side of the display driver to a third side L 3 opposite to the first side L 1 is defined as a first direction DR 1 , a direction from a fourth side L 4 which is a long side of the display driver to a second side L 2 opposite to the fourth side L 4 is defined as a second direction DR 2 , and areas created by dividing the long side of the display driver into three portions along the first direction DR 1 are defined as first to third areas AR 1 to AR 3 in that order, the interface circuit block including an input terminal formation area in which a plurality of input terminals PAD are formed, the input terminal formation area being disposed in the interface circuit block on the second side L 2.

1. A display driver comprising an interface circuit block which is disposed in a second area of first to third areas and transfers data through a serial bus using differential signals, when a direction from a first side which is a short side of the display driver to a third side opposite to the first side is defined as a first direction, a direction from a fourth side which is a long side of the display driver to a second side opposite to the fourth side is defined as a second direction, and areas created by dividing the long side of the display driver into three portions along the first direction are defined as first to third areas in that order, the interface circuit block including an input terminal formation area in which a plurality of input terminals are formed, the input terminal formation area being disposed in the interface circuit block on the second side. 
   
   
     2. The display driver as defined in  claim 1 , wherein the interface circuit block is provided so that the interface circuit block overlaps a center line which passes through a center point of the second area and is parallel to the second direction. 
   
   
     3. The display driver as defined in  claim 1 ,
 wherein the plurality of input terminals are disposed in the input terminal formation area at given intervals along the first direction; 
 wherein the input terminal formation area includes a plurality of input terminal-to-input terminal areas, each of the input terminal-to-input terminal areas being an area which is positioned between adjacent two input terminals among the plurality of input terminals and in which the plurality of input terminals are not formed; and 
 wherein a protection circuit is provided in a semiconductor layer in at least one of the input terminal-to-input terminal areas. 
 
   
   
     4. The display driver as defined in  claim 3 , wherein the protection circuit is not formed in the semiconductor layer in an input terminal arrangement area in which each of the plurality of input terminals is disposed. 
   
   
     5. The display driver as defined in  claim 3 ,
 wherein the plurality of input terminals include a plurality of differential signal input terminals for supplying the differential signals to the interface circuit block; and 
 wherein the protection circuit is provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to at least one of the differential signal input terminals. 
 
   
   
     6. The display driver as defined in  claim 5 , wherein the protection circuit provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to at least one of the differential signal input terminals connects a first power supply line which is a power supply line for the display driver and is used to supply a first power supply voltage with the at least one differential signal input terminal. 
   
   
     7. The display driver as defined in  claim 3 ,
 wherein the plurality of input terminals include a first power supply input terminal for supplying a first power supply voltage to the interface circuit block; and 
 wherein the protection circuit is provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to the first power supply input terminal. 
 
   
   
     8. The display driver as defined in  claim 6 ,
 wherein the plurality of input terminals include a first power supply input terminal for supplying the first power supply voltage to the interface circuit block; and 
 wherein the protection circuit is provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to the first power supply input terminal. 
 
   
   
     9. The integrated circuit device as defined in  claim 7 , wherein the protection circuit provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to the first power supply input terminal connects a first power supply line which is a power supply line for the display driver and is used to supply the first power supply voltage with the first power supply input terminal. 
   
   
     10. The display driver as defined in  claim 7 ,
 wherein the plurality of input terminals include a second power supply input terminal for supplying a second power supply voltage higher than the first power supply voltage to the interface circuit block; and 
 wherein the protection circuit is provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to the second power supply input terminal. 
 
   
   
     11. The display driver as defined in  claim 10 , wherein the protection circuit provided in the semiconductor layer in the input terminal-to-input terminal area adjacent to the second power supply input terminal is provided between a first power supply line which is a power supply line for the display driver and is used to supply the first power supply voltage and the second power supply input terminal. 
   
   
     12. The display driver as defined in  claim 3 ,
 wherein the plurality of input terminals include: 
 a plurality of differential signal input terminals for supplying the differential signals to the interface circuit block; 
 a plurality of first power supply input terminals for supplying a first power supply voltage to the interface circuit block; and 
 a plurality of second power supply input terminals for supplying a second power supply voltage higher than the first power supply voltage to the interface circuit block; and 
 wherein the first power supply input terminal, the second power supply input terminal, the second power supply input terminal, the first power supply input terminal, the differential signal input terminals, the first power supply input terminal, the second power supply input terminal, the second power supply input terminal, and the first power supply input terminal are disposed in that order along the first direction. 
 
   
   
     13. The display driver as defined in  claim 3 ,
 wherein the input terminal formation area includes: 
 first and second power supply input terminal formation areas in which a plurality of first power supply input terminals for supplying a first power supply voltage to the interface circuit block and a plurality of second power supply input terminals for supplying a second power supply voltage higher than the first power supply voltage to the interface circuit block are disposed; and 
 a differential signal input terminal formation area in which a plurality of differential signal input terminals for supplying the differential signals to the interface circuit block are disposed; and 
 wherein the differential signal input terminal formation area is provided between the first and second power supply input terminal formation areas along the first direction. 
 
   
   
     14. The display driver as defined in  claim 13 , wherein the plurality of input terminals are disposed in each of the first and second power supply input terminal formation areas in an order of the first power supply input terminal, the second power supply input terminal, the second power supply input terminal, and the first power supply input terminal along the first direction. 
   
   
     15. The display driver as defined in  claim 3 ,
 wherein the interface circuit block includes: 
 first to Sth receiver circuits, each of which receives the differential signals; and 
 a bias circuit for supplying a constant voltage to the first to Sth receiver circuits; and 
 wherein the first to [S/2]th ([X] is a maximum integer equal to or less than X) receiver circuits, the bias circuit, and the ([S/2]+1)th to Sth receiver circuits are disposed in that order along the first direction. 
 
   
   
     16. The display driver as defined in  claim 15 ,
 wherein the interface circuit block includes a logic circuit which processes signals from the first to Sth receiver circuits; and 
 wherein, when a direction from the second side which is the long side of the display driver to the fourth side opposite to the second side is defined as a third direction, the logic circuit is disposed on a side of the first to Sth receiver circuits in the third direction.